linux-kernel - Re: [PATHCv10 1/2] usb: USB Type-C connector class

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Date:   Mon, 14 Nov 2016 16:08:26 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Oliver Neukum <oneukum@...e.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Bin Gao <bin.gao@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATHCv10 1/2] usb: USB Type-C connector class

On Mon, Nov 14, 2016 at 04:39:10PM +0200, Heikki Krogerus wrote:
> On Mon, Nov 14, 2016 at 03:11:23PM +0100, Greg KH wrote:
> > On Mon, Nov 14, 2016 at 02:32:35PM +0200, Heikki Krogerus wrote:
> > > > > +static void __exit typec_exit(void)
> > > > > +{
> > > > > +	class_unregister(&typec_class);
> > > > 
> > > > You forgot to clean up your idr :(
> > > 
> > > Sorry, what idr? The port ids get removed in typec_release().
> > 
> > You have a static idr structure in the driver, right?  You have to clean
> > it up when your code is going away so that it will free any memory it
> > had allocated with a call to idr_destroy() on module exit.
> 
> Ok.
> 
> Regarding the DEVICE_ATTR* macros. So I have attributes with same
> names for different device types. I may be able to identify the device
> types and deal with the correct attribute based on that, but for
> example the attribute "active" with alternate modes is writable, but
> with cables it's not. How do I handle those?

The attribute init callback should let you handle this, right?  You'll
have to add it for your dynamic attributes.

thanks,

greg k-h